Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/0003—Making bridge-work, inlays, implants or the like
  • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C5/00—Filling or capping teeth
  • A61C5/70—Tooth crowns; Making thereof
  • A61C5/77—Methods or devices for making crowns

Definitions

• the invention relates to a method for patient-specific Manufacture and supply of prosthetic workpieces such as crowns, bridges or the like and is used in dentistry and dental technology.
• This model must be manufactured with the greatest accuracy, because the tolerance between the model or the one manufactured afterwards Workpiece and the ground teeth in the range of substantially 25 ⁇ m. Due to the shrinkage or volume change properties of the material with the help of which impressions of model making, the problem arises that the lumen of the impression does not match the volume of the ground Tooth stump matches.
• the process for making the model arises, to be able to manufacture the dental prosthetic workpiece, very much complex and complicated.
• the above-mentioned Get impression for taking the die and the surrounding area then the negative form thus provided poured out.
• the die part in question is removed and in the lost wax process a substructure for the later production of the dental prosthetic Workpiece manufactured.
• This workpiece is then in a large number of sub-steps with several try-ins on the patient in the interplay between dental practice and laboratory optimized. This is particularly painful and uncomfortable for this repeated removal and reapplication required of the temporary.
• the processing of the model takes place with the known teaching the machine described there in detail and not by manual application of grinding or milling technology by the respective dental technician, based on their manual work Skill and existing experience.
• the use of the special Machine is necessary because the processing document contains all the movement data of the machine to be on the Based on this data, later grinding in the patient's mouth to be able to repeat, so to speak.
• An essential basic idea of the invention is that contrary to conventional positive-negative technology, exclusively the positive technique is used, whereby a preparation, d. H. Pretreatment of the jaw to be treated with the aim of Later attachment of dentures to only one 1: 1 planning model.
• This grinding can be computer-assisted using a database after prior visualization in connection done automatically with the treatment strategy, taking off a variety of geometric shapes available in the database particularly expedient and adapted to the respective jaw shape Grinding forms can be selected.
• the prepared one Condition by optical and / or mechanical scanning the existing geometric configuration.
• the prosthetic workpiece is made in a known manner made, but this only with the help of the planning model takes place without the patient in Must be used. Nor are there any other bites, Try-on, making and inserting temporary restorations necessary.
• This milling and grinding device is predetermined Bases arranged intraorally, or with the exception of the actual one Grinding or milling head, provided extraorally.
• Another basic idea of the invention is for the Impression of the initial situation using a material whose Volume during the molding and hardening process essentially unchanged remains.
• the initial state of the same or the initial state on the planning model of the jaw to be treated by optically and / or mechanical scanning recorded and stored.
• This data set is computer-aided using a three-dimensional visualization a treatment strategy worked out and determined which support points in the jaw to choose and what geometric shape is after grinding and / or milling, drilling or the like.
• essential properties of the prosthetic workpiece can be simulated with the help of the computer, which makes the manual Effort in the production which is carried out in a known manner of the prosthetic workpiece itself further reduced.
• the dental technician and / or dentist can use planning data entered or existing planning data updated, which changes the relevance of those offered by the database geometric configurations, based on the initial state, increased with regard to the entered empirical values.
• this prosthetic work is the placement of implants, the milling of shifted teeth and the splitting of Can include jaws during osteotomy surgery.
• the method according to the invention can also be used numerically controlled, automatic grinding, d.
• H. Prepare the teeth in the patient's mouth based on a predetermined, finished data set the desired parallel position of the surfaces be realized for the training stumps in a way which cannot be reached manually or only with great effort.
• the required accuracy of fit i. H. the tolerances between the result of the preparation in the patient's oral cavity and the manufactured prosthetic workpiece are included the method according to the invention guaranteed without expensive rework. Any corrections that may become necessary on Planning model can be done by the dentist without repeated consultation be performed by the patient, after a correction accordingly updated record is created.
• the method according to the invention results in a extraordinarily high accuracy of fit of the workpieces to be integrated and a significant reduction in working hours. At the same time the burden on patient and dentist is reduced. Furthermore, the otherwise necessary preparation time is omitted an impression after preparation on the patient, the otherwise for hemostasis, drying and introduction of the Retraction threads are required as well as the impression on the prepared teeth themselves.
• the situation of the patient to be treated is molded Jaw including the bite in the dental Practice.
• the impression is then poured out in the dental laboratory in a 1: 1 ratio with a suitable casting resin Volume stability made.
• the planning model thus obtained is mounted in the articulator according to the facebow and an appropriate registration was made.
• the saved data record then becomes a numerical one Controlled milling and grinding device, which is in the dental practice.
• This grinder is fixed on or in the patient's oral cavity and grinding is carried out on the basis of the available data of the teeth.
• the dental prosthetic workpiece that has now been manufactured can then immediately after finishing the grinding process, d. H. of the Preparation, tried on and cemented in the patient's oral cavity become.
• the planning model can be done manually by the dentist or Grind dental technician and then optically and / or mechanically scanned, with the preparation corresponding the data stored in the patient's oral cavity is made.
• the prosthetic work is done manually performed in a known manner by the dental technician.
• the prosthetic work is not manually by the dental technician, but according to the corresponding Planning by the dental technician and / or dentist with the help a computer model by a numerically controlled device automatically manufactured.
• the planning model using the mentioned Database information automatically by means of a numerically controlled Grinding and milling machine are manufactured, the Preparation of the prosthetic work in a manual manner done by the dental technician according to the state of the art.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
• Dental Prosthetics (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)
• Dental Preparations (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=6535416

Family Applications (1)

Country Status (8)

Families Citing this family (8)

Family Cites Families (3)

• 1994
  • 1994-12-09 DE DE4443929A patent/DE4443929C1/de not_active Expired - Lifetime
• 1995
  • 1995-12-04 AU AU41776/96A patent/AU4177696A/en not_active Abandoned
  • 1995-12-04 WO PCT/EP1995/004764 patent/WO1996017561A1/de not_active Ceased
  • 1995-12-04 EP EP95940270A patent/EP0796063B1/de not_active Expired - Lifetime
  • 1995-12-04 CA CA002206703A patent/CA2206703A1/en not_active Abandoned
  • 1995-12-04 JP JP8517314A patent/JPH11501824A/ja not_active Ceased
  • 1995-12-04 AT AT95940270T patent/ATE179582T1/de not_active IP Right Cessation
  • 1995-12-04 DE DE59505863T patent/DE59505863D1/de not_active Expired - Fee Related
  • 1995-12-04 DK DK95940270T patent/DK0796063T3/da active

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